A: You can find specifications for archery equipment in the 2014 Big Game seasons and rules book (page 100). Under Archery equipment it reads: "it is unlawful to pursue or kill big game animals: with a bolt (crossbow) less than 12 inches from broadhead to nock inclusive."
The answer to your question ...

A: Yes. You must have an Idaho fishing license and can only use this type of gear on nongame fish such as carp and suckers. More information:
Archery and Spear Fishing: Fishing with a bow and arrow, crossbow, spear or mechanical device, excluding firearms.
This type of fishing is permitted only in ...